Basic Cisco Router configuration
This page includes basic feature-by-feature configuration procedures, I must assume you have generated you IP addressing scheme for your network.
After your router boots, the following prompt displays:
Would you like to enter the initial configuration dialog [yes]:
Enter no.
You want to clear an old configuration out of your router and return it to a factory default configuration. Before you begin your configuration on an old router that you have previously used for another purpose, it is a good idea to completely erase the old configuration:-
Router1#erase startup-config
Erasing the nvram filesystem will remove all files! Continue? [confirm] <enter>
[OK]
Erase of nvram: complete
Router1#reload
Proceed with reload? [confirm] <enter>
After you erase your startup configuration file and reload, the router will enter its configuration dialog mode.
--- System Configuration Dialog ---
Would you like to enter the initial configuration dialog? [yes/no]: no
Would you like to terminate autoinstall? [yes]: yes
Press RETURN to get started!
Router>
There are different modes in Cisco IOS command- line interface, there different mode have their own primary functions and sets of commands.
The first mode you come across is :-
Router> – You are in User EXEC mode
Then type ‘enable’ and hit the enter key
You go to privileged EXEC mode which will display like this:
Router#
In this mode you could ask or query (argument) the router for some information like:
Show ? – The router will provide a list of information on its configuration which most times are very helpful.
Type ‘config terminal’ and hit the enter key to take you
into Global configuration mode :-
Router1(config)#
In this mode:
you can name your router or hostname
configure your telnet line and console lines
Configure the console and telnet passwords.
Interface configurations, Routing Protocols, etc.
Lets do it one after the other:
Configuring telnet line and password:
Router(config)#enable secret cisco
Router(config)#line vty 0 4
Router(config-line)#password cisco
Router(config-line)#login
Router(config-line)#exit
Configuring console line and password:
Router(config)#line con 0
Router(config-line)#password cisco
Router(config-line)#login
Router(config-line)#exit
Configuring hostname or Router name
Router(config)#hostname HQ
HQ(config)#exit
Configuring interfaces connected to the router ports (fast Ethernet / serial ports)
HQ#config t
Enter configuration commands, one per line. End with CNTL/Z.
HQ(config)#interface fa0/0
HQ(config-if)#ip address 192.168.1.1 255.255.255.0
HQ(config-if)#no shut
HQ(config-if)#exit
You may have noticed how the router name has changed from Router to HQ.
Configure the serial port with number depending on the connected port number:-
HQ(config)#interface serial0/0/0
HQ(config-if)#ip address 192.168.4.1 255.255.255.0
HQ(config-if)#no shut
HQ(config-if)#exit
HQ(config)#
Configure the DCE interface (If interface is a DCE) with clock rate:-
HQ(config)#interface serial0/0/0
HQ(config-if)#clock rate 64000
HQ(config-if)#^Z
HQ#
